package com.gxh.util;

import com.gxh.javabean.User;
import com.gxh.mapper.UserMapper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.List;

public class MyBatisTest {
    SqlSession session;
    UserMapper mapper;
    @Before
    public void a(){
        //1、创建SqlSessionFactory对象，也是单例模式的
        SqlSessionFactory factory = MyBatisUtil.getSqlSessionFactory();
        //2、创建SqlSession对象 true 自动提交事务 不写也没事 因为默认在sqlsession关闭时提交事务
        SqlSession session = factory.openSession(true);
        //3、调用session的方法namespace的名字.id
        UserMapper mapper=session.getMapper(UserMapper.class);
    }
    @After
    public void b(){
        session.close();
    }
    @Test
    public void selectAllUser(){
        List<User> users=mapper.selectAllUser();
        //4、打印测试
        for(User u:users){
            System.out.println(u);
        }
    }
    @Test
    public void selectById(){
        User user=mapper.selectById(2);
        System.out.println(user);
    }

    @Test
    public void updateNameById(){
        mapper.updateNameById(1,"bbb");

    }

}
